Descriptions:
In this Builder Methods episode, host Brian Casel interviews Brennan Dunn—SaaS founder of Write Message, a behavioral personalization platform—who demonstrates the multi-agent development system he has built on top of Claude Code. Rather than using Claude as a one-shot coding assistant, Dunn has architected a pipeline of coordinated sub-agents: a project manager agent that translates business requirements into structured Linear tasks, a senior developer agent that audits the codebase and plans implementation, a browser tester powered by a Puppeteer MCP connection, and a committer that writes clean structured git messages.
The workflow is anchored to Linear via the Linear MCP. When Dunn describes a new feature, the project manager agent populates Linear tasks; the developer agent picks them up, creates feature branches, implements changes, and updates task status in real time. He also walks through Fernesk, a documentation tool that auto-generates help content by parsing the codebase and git commit history. Every agent role is defined in a custom CLAUDE.md file—instructions Dunn wrote iteratively by prompting Claude to write its own role definitions.
The conversation is candid about the mindset shift this enables: Dunn notes that the cost of discarding a feature and starting over has dropped to near zero with AI-generated code, allowing him to optimize for the best solution rather than the fastest one. The full unedited recording—over an hour covering Dunn’s journey from pre-AI full-stack development to running a SaaS on an AI agent team—is available to Builder Methods Pro members.
📺 Source: Brian Casel · Published January 26, 2026
🏷️ Format: Interview
